Rich Harris

Manipulate strings like a wizard

Resolve a chain of sourcemaps back to the original source, like magic

Straightforward project scaffolding

Morph DOM elements from one state to another with smooth animations and transitions

Experimental charting library for Svelte

Use JavaScript modules in all browsers, including dynamic imports

Svelte ❤️ Three

The fast, future-friendly minifier

Check whether a package is tree-shakeable

A simple, modern QR code library

Traverse an ESTree-compliant AST

Experimental toolkit for writing x-to-JavaScript compilers

Use Svelte components inside a React app

Rollup as a service (with a little help from Browserify)

BabyParse is a fast, reliable CSV parser based on PapaParse (http://PapaParse.com)

SvelteKit, running on the edge

Generate, and decode, base64 VLQ mappings for sourcemaps and other uses

No description.

🔊 Stream large audio files without the dreaded 'DOMException: play() can only be initiated by a user gesture' error.

Simulated DOM events for automated testing

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A small utility for managing an undo stack

Just an idea. For now.

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Client-side routing library. It's about the journey, not just the destination

Create a copy of an object with just the bits you actually need

A <SplitPane> component

Promise-based power tool for common filesystem tasks

Movies demo

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The website for the Svelte workshop

Utility for analyzing scopes belonging to an ESTree-compliant AST

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Stuff I often need. WIP

Another Pointer Events polyfill

Local-first, web-based two factor authenticator app

A template for building Electron apps with Svelte

Layout manager for web apps.

Determine which of two elements is in front of the other

Self-documenting Node scripts through literate programming

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a quick Svelte GL demo

The answer to the question of life, the universe and everything

Encode/decode sourcemap mappings

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A quick test to see how various bundlers compare when bundling the Lodash source code.

Declarative handlers in SvelteKit

A very basic Svelte GL scene

Minimum viable testing framework

Parse and manipulate JSON5 strings

Tool for making and loading sprites

Utilities for dealing with ports in Node apps

Using SvelteKit to generate PDFs dynamically

demo repo

Using Svelte and D3 together to create lightweight interactive visualisations with SSR

Begin app

The JavaScript state management library

console.group() for node.js

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bare bones demo of svelte-three

The weather report

Demo of using Svelte and Rollup to create a SSR bundle

An example of generated types

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Traverse a folder in node, turning its contents into an object for easy consumption

a grab-bag of modular easing equations

Determine whether an AST node is a reference

Project template for a TypeScript library

Workshop repo for https://cameoparison.netlify.app

Build AI-powered applications with React and Svelte

An adaptation of Ember's 'dbmonster' demo of Glimmer

Utility for cloning objects and arrays so you can manipulate them without borking your original data

Library for making draggable, zoomable, interactive SVG viewboxes

playing around with websockets

LiveStore is a next-generation state management framework based on reactive SQLite and built-in sync engine.

A matrix manipulation library that tries to explain what the hell's going on

demo of using Svelte with Google Maps

JSON tree component for Svelte

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A playground for seeing how Terser minifies JavaScript

Find and erase strings and comments in JavaScript code

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Smoothly interpolate keyframes

SvelteKit hash-based routing demo

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Pan and zoom the contents of SVG elements, and translate between coordinate systems

Generate short but memorable random names for stuff

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nothing to see here move along

quick script to compare superjson and devalue

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Next generation frontend tooling. It's fast!

A demo of SvelteKit's `read` function

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A stream library

Starter repo for birdland

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sensor.js - DOM events that don't suck

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App that demonstrates cryptography algorithms

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Using accessors to get and set Svelte component data

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The fastest possible dbmonster implementation?

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[ABANDONED] A CSV parser.

Repro for https://github.com/sveltejs/kit/issues/8516

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A neat wrapper around node.js fs.watch / fs.watchFile.

Parse CSS into JSON

Fork of StackBlur (http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html), used in canvg

No description.

Svelte / Ivy comparison

A high-performance Markdown parser and renderer for Vue, React, Svelte, HTML and ANSI.

Best practices for modern web development

A small library to parse tar and tar.gz files using only javascript

adapter-node repro

web development, streamlined

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A version of eval that helps you find syntax errors in generated code. For browsers and node.js

Illustration of issues around use of top-level await in Vite apps

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Reproduction of `vite.ssrLoadModule` bug

Simple app to demonstrate Svelte's `{@debug}` tag

Next-generation DOM manipulation

Making SvelteKit forms a pleasure to use!

3D framework for Svelte

Alternative, TypeScript parser

Embed inline audio clips

repro for https://github.com/sveltejs/kit/issues/8303

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A new kind of frontend build tool. Fast, lightweight, unbundled. ✌️

Bug repro

🌳 Tiny and fast JavaScript code generator from an ESTree-compliant AST.

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Repro

Vite repro

Demo of Ractive.js with the ractive-load plugin

Example app built with Rollup

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@vercel/nft repro

Illustration of Vite relative base issue

The Intuitive Vue Framework.

collection of dotfiles. WIP

A WKT/WKB/EWKT/EWKB/TWKB/GeoJSON parser and serializer.

Web app for crowdsourcing preferences about index weighting such as the Human Development Index. Powers the YourTopia site - Global Development beyond GDP.

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Tools for working with ESTree AST

repro

trying to debug something

Demo for https://github.com/sveltejs/kit/issues/6031

Node.js dependency tracing utility

`vc deploy --prebuilt` test

Shims for new ES modules features on basic modules support in browsers

A guided tour through the best free coding tutorials on the web

:leaves: JavaScript library for mobile-friendly interactive maps

JavaScript 3D library.

gl-matrix's mat4, split into smaller pieces

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:koala: - PouchDB is a pocket-sized database.

repro for https://github.com/sveltejs/kit/issues/14444

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Continuous (Preview) Releases for your libraries!

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Shell repository to redirect rich-harris.co.uk/esperanto to esperantojs.org

Let's evaluate the performance of SSR libraries

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vercel edge function test

WebContainer API Documentation

nothing to see here, move along...

Repro for https://github.com/sveltejs/kit/issues/5952

Playground to test repaint rates of JS libs

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Super-fast alternative to Babel for when you can target modern JS runtimes

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bug repro

ECMAScript proposal for type syntax that is erased - Stage 1

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my website

Speech recognition experiment

Course outline for Design & Code 2

Demo for https://stackoverflow.com/questions/45638717/using-rollup-svelte-with-third-party-amd-libraries

Slides for a talk - 'the reactive programming revolution'

Babel is a transpiler for writing next generation JavaScript.

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A declarative, efficient, and flexible JavaScript library for building user interfaces.

Vite plugin for generating `com.chrome.devtools.json` on the fly in the devserver.

Async Context for JavaScript

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A svelte component to create a CodeMirror 6+ editor

Quick and easy tool for journalists to turn tabular data (csvs, or pasted from Excel etc) into HTML tables

Astro documentation

vite-mode-repro

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A reactive programming library for JavaScript